A 28-year-old man was shot and fatally wounded early Sunday on the grounds of a public housing project in the unincorporated Contra Costa County community of Rodeo, officials said. A 28-year-old Benicia man was later arrested in the slaying.

The victim, whom authorities would not identify Sunday, arrived at Doctors Medical Center in San Pablo with gunshot wounds, and Contra Costa County sheriff's deputies were dispatched to the hospital shortly after 3 a.m., officials said.

The victim was transferred to John Muir Medical Center in Walnut Creek, where he died at about 9:20 a.m., according to the Contra Costa County Sheriff's Office.

Deputies later arrested Beal Xavier Hickman of Benicia and booked him into jail on suspicion of homicide and other charges, sheriff's office spokesman Jimmy Lee said in a statement. Hickman was being held in lieu of $1.32 million in bail.

Detectives are still trying to establish a motive, Lee said. Investigators determined that the shooting happened on Tullibee Court in Rodeo, which is on the grounds of the Housing Authority of the County of Contra Costa.

Authorities are asking anyone with information about the case to contact the Contra Costa County Office of the Sheriff Investigation Division at (925) 313-2600. For any tips, please e-mail tips@so.cccounty.us or call (866) 846-3592 to leave an anonymous voice message.